Which solution will meet these requirements?
Provision an EC2 instance that uses NFS server software. Attach a single 500 GB gp2 EBS volume to the instance.
Provision an Amazon FSx for Windows File Server file system. Configure the file system as an SMB file store within a single Availability Zone.
Provision an EC2 instance with two 250 GB Provisioned IOPS SSD EBS volumes.
Provision an Amazon Elastic File System (Amazon EFS) file system. Configure the file system to use General Purpose performance mode.
Explanations:
An NFS server on a single EC2 instance introduces a single point of failure and does not provide high availability. If the instance fails, the application loses access to the data.
Amazon FSx for Windows File Server is a good option for Windows environments but does not provide cross-instance access for Linux applications and can introduce unnecessary complexity. Additionally, it operates in a single Availability Zone unless a multi-AZ configuration is specified, which could limit availability.
Using two 250 GB Provisioned IOPS SSD EBS volumes does not solve the requirement for shared access among multiple EC2 instances, as EBS volumes can only be attached to a single EC2 instance at a time.
Amazon EFS is designed for shared access across multiple EC2 instances. It provides high availability, scalability, and resilience, making it suitable for an Auto Scaling group setup without requiring significant code changes for the application.
It seems to me that the answer is:
Provision an Amazon Elastic File System (Amazon EFS) file system. Configure the file system to use General Purpose performance mode.